sched/core: Make migrate disable and CPU hotplug cooperative

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On CPU unplug tasks which are in a migrate disabled region cannot be pushed
to a different CPU until they returned to migrateable state.

Account the number of tasks on a runqueue which are in a migrate disabled
section and make the hotplug wait mechanism respect that.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Link: https://lkml.kernel.org/r/20201023102347.067278757@infradead.org

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Thomas Gleixner 2020-08-26 14:08:10 +02:00 • committed by Peter Zijlstra

parent 6d337eab04

commit 3015ef4b98

2 changed files with 34 additions and 6 deletions

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38

kernel/sched/core.c

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4

kernel/sched/sched.h

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